I noticed a similar issue with mine today. I couldn’t reach the webpage of my AC-5300, regardless of which browser I used. I could ping the IP address and ssh into the router. A soft reboot (from the command line) didn’t help, so a hard reset was also the only option. But unlike you, only hard rebooting the router was enough.
What makes it even weirder: the router is rebooted every Monday- and Friday morning at 3 AM. Checking the logs, sure enough: the router was rebooted this morning as well.
Dumb enough I forgot to check the process with top, as suggested. Then again: working with Linux-based firewalls on a daily basis hanging processes in kernel space won’t show in top.
So i did check and here is the results.
ASUSWRT-Merlin RT-AC86U 384.13-0 Wed Jul 31 17:30:41 UTC 2019
Root@RT-AC86U:/tmp/home/root# top
Mem: 405208K used, 35212K free, 2516K shrd, 20K buff, 58184K cached
CPU: 9.0% usr 4.5% sys 0.0% nic 86.3% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 2.94 3.04 3.06 1/154 26277
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
937 1 Root S 9856 2.2 1 9.0 cfg_server
952 1 Root S 51256 11.6 0 0.0 amas_lib
287 1 Root S 18504 4.1 1 0.0 /bin/swmdk
28181 1 Root S < 15960 3.6 1 0.0 dcd -i 3600 -p 43200 -b -d /tmp/bwdpi/
815 1 Root S 12948 2.9 0 0.0 httpd -i br0
11243 1 Root S 11488 2.6 1 0.0 /usr/sbin/smbd -D -s /etc/smb.conf
921 1 Root S 11432 2.5 0 0.0 roamast
11241 1 Root S 11208 2.5 0 0.0 nmbd -D -s /etc/smb.conf
11242 11241 Root S 11184 2.5 1 0.0 nmbd -D -s /etc/smb.conf
762 1 Root S 11164 2.5 1 0.0 nt_monitor
857 819 Root S 10428 2.3 1 0.0 vis-dcon
764 1 Root S 10408 2.3 1 0.0 /sbin/netool
13299 1 Root S 9532 2.1 0 0.0 wred -B
1 0 Root S 9300 2.1 1 0.0 /sbin/init
777 1 Root S 9080 2.0 1 0.0 nt_center
883 1 Root S 8888 2.0 0 0.0 mastiff
878 1 Root S 8448 1.9 1 0.0 networkmap --bootwait
892 1 Root S 8364 1.9 0 0.0 pctime
825 1 Root S 8360 1.8 0 0.0 watchdog
757 1 Root S 8360 1.8 0 0.0 /sbin/wanduck
27998 1 Root S 8360 1.8 0 0.0 usbled
13343 1 Root S 8360 1.8 1 0.0 bwdpi_wred_alive
1585 1 Root S 8360 1.8 0 0.0 disk_monitor
625 1 Root S 8360 1.8 1 0.0 console
788 1 Root S 8360 1.8 0 0.0 wpsaide
790 787 Root S 8360 1.8 0 0.0 ATE Get_WanLanStatus
884 1 Root S 8360 1.8 0 0.0 bwdpi_check
1246 1 Root S 7536 1.7 1 0.0 u2ec
13050 1 Root S 6088 1.3 0 0.0 /usr/sbin/stubby -g -C /etc/stubby/stubby.yml
819 1 Root S 5308 1.2 1 0.0 vis-dcon
763 1 Root S 5296 1.2 1 0.0 protect_srv
13053 1 nobody S 5144 1.1 0 0.0 dnsmasq --log-async
13054 13053 Root S 4892 1.1 0 0.0 dnsmasq --log-async
821 1 Root S 4700 1.0 0 0.0 vis-datacollector
903 1 Root S 4636 1.0 1 0.0 nt_actMail
797 1 Root S 4532 1.0 0 0.0 /usr/sbin/wlceventd
785 1 Root S 4224 0.9 1 0.0 /bin/wps_monitor
789 1 Root S 4168 0.9 1 0.0 /usr/sbin/wlc_nt
832 1 Root S 4164 0.9 0 0.0 rstats
27985 1 Root S 3720 0.8 1 0.0 /usr/sbin/ntp -t -S /sbin/ntpd_synced -p pool.ntp.org -p time.nist.gov
786 1 Root S 3420 0.7 1 0.0 nas
26265 26257 Root S 3368 0.7 0 0.0 -sh
27991 1 Root S 3364 0.7 1 0.0 /sbin/klogd -c 5
12507 1 Root S 3364 0.7 0 0.0 /sbin/udhcpc -i eth1 -p /var/run/udhcpc1.pid -s /tmp/udhcpc -O33 -O249
27989 1 Root S 3364 0.7 1 0.0 /sbin/syslogd -m 0 -S -O /tmp/syslog.log -s 256 -l 6
814 1 Root S 3364 0.7 1 0.0 crond -l 9
787 815 Root S 3364 0.7 0 0.0 sh -c ATE Get_WanLanStatus
12780 1 Root S 3364 0.7 1 0.0 /sbin/zcip -p /var/run/zcip1.pid eth1 /tmp/zcip
17480 1 Root S 3364 0.7 1 0.0 /sbin/udhcpc -i eth0 -p /var/run/udhcpc0.pid -s /tmp/udhcpc -O33 -O249
26274 26265 Root R 3364 0.7 0 0.0 top
936 932 nobody S 3316 0.7 1 0.0 lldpd -L /usr/sbin/lldpcli -I eth2,eth3,eth4,eth5,eth6,wds0.*.*,wds1.*.*,wds2.*.* -s RT-AC86U
Mem: 405500K used, 34920K free, 2516K shrd, 20K buff, 58184K cached
CPU: 0.2% usr 1.0% sys 0.0% nic 98.6% idle 0.0% io 0.0% irq 0.1% sirq
Load average: 3.02 3.06 3.06 1/154 26282
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
210 2 Root SW 0 0.0 0 0.4 [bcmsw_rx]
878 1 Root S 8448 1.9 1 0.2 networkmap --bootwait
825 1 Root S 8360 1.8 0 0.2 watchdog
785 1 Root S 4224 0.9 0 0.1 /bin/wps_monitor
832 1 Root S 4164 0.9 0 0.1 rstats
287 1 Root S 18504 4.1 1 0.0 /bin/swmdk
26274 26265 Root R 3368 0.7 0 0.0 top
211 2 Root SW 0 0.0 1 0.0 [bcmsw]
952 1 Root S 51256 11.6 0 0.0 amas_lib
28181 1 Root S < 15960 3.6 1 0.0 dcd -i 3600 -p 43200 -b -d /tmp/bwdpi/
815 1 Root S 12948 2.9 0 0.0 httpd -i br0
11243 1 Root S 11488 2.6 1 0.0 /usr/sbin/smbd -D -s /etc/smb.conf
921 1 Root S 11432 2.5 0 0.0 roamast
11241 1 Root S 11208 2.5 0 0.0 nmbd -D -s /etc/smb.conf
11242 11241 Root S 11184 2.5 1 0.0 nmbd -D -s /etc/smb.conf
762 1 Root S 11164 2.5 1 0.0 nt_monitor
857 819 Root S 10428 2.3 0 0.0 vis-dcon
764 1 Root S 10408 2.3 1 0.0 /sbin/netool
937 1 Root S 9856 2.2 1 0.0 cfg_server
13299 1 Root S 9532 2.1 0 0.0 wred -B
1 0 Root S 9300 2.1 1 0.0 /sbin/init
777 1 Root S 9080 2.0 1 0.0 nt_center
883 1 Root S 8888 2.0 0 0.0 mastiff
892 1 Root S 8364 1.9 0 0.0 pctime
757 1 Root S 8360 1.8 0 0.0 /sbin/wanduck
27998 1 Root S 8360 1.8 0 0.0 usbled
13343 1 Root S 8360 1.8 1 0.0 bwdpi_wred_alive
1585 1 Root S 8360 1.8 0 0.0 disk_monitor
625 1 Root S 8360 1.8 1 0.0 console
788 1 Root S 8360 1.8 0 0.0 wpsaide
790 787 Root S 8360 1.8 0 0.0 ATE Get_WanLanStatus
884 1 Root S 8360 1.8 0 0.0 bwdpi_check
1246 1 Root S 7536 1.7 1 0.0 u2ec
13050 1 Root S 6088 1.3 0 0.0 /usr/sbin/stubby -g -C /etc/stubby/stubby.yml
819 1 Root S 5308 1.2 1 0.0 vis-dcon
763 1 Root S 5296 1.2 1 0.0 protect_srv
13053 1 nobody S 5144 1.1 0 0.0 dnsmasq --log-async
13054 13053 Root S 4892 1.1 0 0.0 dnsmasq --log-async
821 1 Root S 4700 1.0 1 0.0 vis-datacollector
903 1 Root S 4636 1.0 1 0.0 nt_actMail
797 1 Root S 4532 1.0 1 0.0 /usr/sbin/wlceventd
789 1 Root S 4168 0.9 1 0.0 /usr/sbin/wlc_nt
27985 1 Root S 3720 0.8 1 0.0 /usr/sbin/ntp -t -S /sbin/ntpd_synced -p pool.ntp.org -p time.nist.gov
786 1 Root S 3420 0.7 1 0.0 nas
26265 26257 Root S 3368 0.7 0 0.0 -sh
27991 1 Root S 3364 0.7 0 0.0 /sbin/klogd -c 5
12507 1 Root S 3364 0.7 0 0.0 /sbin/udhcpc -i eth1 -p /var/run/udhcpc1.pid -s /tmp/udhcpc -O33 -O249
27989 1 Root S 3364 0.7 0 0.0 /sbin/syslogd -m 0 -S -O /tmp/syslog.log -s 256 -l 6
814 1 Root S 3364 0.7 1 0.0 crond -l 9
787 815 Root S 3364 0.7 0 0.0 sh -c ATE Get_WanLanStatus
12780 1 Root S 3364 0.7 1 0.0 /sbin/zcip -p /var/run/zcip1.pid eth1 /tmp/zcip
Mem: 405772K used, 34648K free, 2516K shrd, 20K buff, 58184K cached
CPU: 0.8% usr 1.5% sys 0.0% nic 97.5% idle 0.0% io 0.0% irq 0.1% sirq
Load average: 3.02 3.05 3.06 2/154 26287